A guide distributed to AT&T Plant Division employees maintaining Stored Program Control telephone switches such as the #1 and #2 ESS as well as their interfacing with systems such as the #4 Crossbar.
An important detail with this guide is that each "page" except for the cover and its back consists of three separate flip decks. The intent of the guide is to flip the decks independently of one another to establish a visual representation of a particular switching scenario, for instance a #1 ESS exchange through standard interoffice facilities to a #2 ESS exchange.
The date of this posting is given as 1975 but no date is visible on the materials. The cover motif suggests a production date sometime in the 1970s.
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